A Few Contaminated Batches
Although most of my beers have been coming out 'clean', I've had a couple of my beers show up with what I think might be bretanomyaces or some other 'bug'. The contamination shows-up after they're bottled and have sit at room temperature for a while. It has that slight "cherry pie" flavor that shouldn't be there.
Oxi-Clean and Star-San
My standard cleaning process includes overnight soak of the auto siphon and plastic carboy with Oxi-Clean Free. I put about 1/2 cup of Oxi-Clean into the carboy with 5 gallons of hot (120F) city tap water and pump it through the auto siphon. The next day all visible material adhering to the carboy walls is gone. I triple rinse with city tap water. I then put a few cups of properly mixed Star-San solution into the carboy, pump it through the auto siphon, swirl to hit all interior surfaces, dump the Star-San and store the equipment. Before using the carboy or auto siphon again, I repeat the Star-San step. I don't think the contamination is from my counterflow chiller, but I'll mention that I store it full of Star-San, then during the boil, I run boiling wort through it without the chilling water turned on. So it sits at well over 150F for 10 minutes before I start the chilling process.
Apparently my sanitation practices are not good enough. I presume the problem is in the carboy and racking (I don't ever secondary, just bottle). So the question is, what should I do to "bring out the big guns" from a cleaning perspective. An easy step 1 is to throw out all my vinyl hoses. Consider that done!. But what to do about my auto siphon, which I'd hate to throw out. And also my plastic carboys. I don't see any scratching on them, and I've kept from using brushes on them, ever.
Bringing Out the Big Guns for Cleaning/Sanitizing
What more powerful cleaning solutions are available to me? Bleach? Boiling water? I saw something in another post about quat or something like that? I have not used PBW, and understand it's different than Oxi-Clean, but is that going to make the difference? I don't want to get into a religious rant about sanitizers, but is Star-San letting me down? I've never used Iodaphor, and don't know much about it. Should I use a powerful "yes-rinse" sanitizer first, and a no-rinse sanitizer after? If you have suggestions, please recommend specific concentrations.